Behaviour During Start-Up; Normal Start-Up; Start-Up Without Flame Signal - Honeywell krom schroeder IFD 258 Manual

4 .3 Behaviour during start-up

4 .3 .1 Normal start-up

The safety time t can be read on the type label (pa-
SA
rameter 22).
01
t W
t Z
t SA
Once the start-up signal () has been applied, the au-
tomatic burner control unit checks the burner for flame
simulation during the waiting time t
lation is detected during that period, the safety time
on start-up t (3, 5 or 10 s) then starts to elapse. This
SA
forms the minimum operating time of the automatic
burner control unit and the burner. Voltage is supplied
to the gas valve and ignition transformer. After the safe-
ty time on start-up t has elapsed and the flame signal
SA
has been received, the operation signalling contact be-
tween terminals 13 and 14 closes. The display indicates
the current program status 04 .
IFD 258 · Edition 03.12l
04 88
1
L1

3
10
11
5
13-14
8-9
t
. If no flame simu-
W
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4 .3 .2 Start-up without flame signal

01
t W t Z
t SA
If, after a successful burner start, the automatic burner
control unit does not detect a flame signal during the
safety time on start-up t
(fault signalling contact between terminals 8 and 9
closes). During the entire safety time on start-up t
the gas valve V1 is open. The display blinks and indi-
cates .
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88
0
1
L1
3
10
11
5
13–14
8–9
t
, a fault lock-out will occur
SA
,
SA
20